Bug report: Magic operation doesn't work

[cmaloney3030]

Describe the bug
Trying to call the Magic operation returns the error: "Cannot read property 'undefined' of undefined"

To Reproduce
I started off by trying one of your examples and just changed the operation. When the op was "from morse code" it worked correctly, but does not work when given this input:

curl -X POST -H "Content-Type:application/json" -d '{"input":"... ---:.-.. --- -. --. --..--:.- -. -..:- .... .- -. -.- ...:..-. --- .-.:.- .-.. .-..:- .... .:..-. .. ... ....", "recipe":{"op":"Magic","args":[3,false,false,""]}}' localhost:3000/bake

Expected behavior
The same output as the "from morse code" operation

Node version:
v10.17.0

[d98762625]

Thanks @cmaloney3030 I haven't tried with the magic operation yet.

[d98762625]

Started solving with this PR